Math · NUMORA
Triangle Calculator
SSS via Heron, or two legs of a right triangle.
Open interactive calculatorHow to use
SSS or two legs.
Formula
Heron: √[s(s−a)(s−b)(s−c)]; right: ab/2
FAQ
Is this Triangle calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
SSS or two legs.
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